Demountable beam compass



Sept. 11,. 1951 c. M. WOODWARD DEMOUNTABLE BEAM COMPASS Filed NOV. 1,1949 Clarence M Waadward ATTORN EY Patented Sept. 11, 1951 UNITED STATESPATENT OFFICE (Granted under the act of March 3, 1883, as amended April30, 1928; 370 O. G. 757) 3 Claims.

The invention described herein may be manufactured and used by or forthe Government of the United States for governmental purposes withoutpayment to me of any royalty thereon in accordance with the provisionsof the act of April 30, 1928 (ch. 460, 45 Stat. L. 467).

This invention relates to a drafting instrument of the beam compass typeand particularly to one which includes a pen of the bow compass type, awooden rectangular bar, a spring clip for detachably fastening saidcompass to said bar and a second spring clip provided with an adjustableclamp for a needle which forms a pivot.

In the accompanying drawing which illustrates a preferred embodiment ofmy invention:

Figure 1 is a side elevation of my assembled instrument.

Figure 2 is a detail of a compass mounting clip.

Figure 3 is a detail of a companion pivot mounting clip.

Figure 4 is a cross-section of a clip.

Figure 5 is a cross-section on line 55, Figure 3.

In these drawings:'

A U-shaped clip In is formed of resilient sheet metal with one leg l2longer than the companion leg I l and with a triangular shaped prong I3,the use of which will be disclosed later in this specification, and arectangular punching l4 bent into an L shape for attaching a channelmember [5 to the face of the clip 10. The detachable channel member [5is provided with a transverse threaded hole I6 for receiving a set screwIT, by means Of which the pivot leg 18 of a bow compass I9 is rigidlyattached to the clip 10. A second spring clip 20 is provided with asleeve member 2| corresponding to the channel member provided with aguiding hole for a pivot pin 22 and a transverse threaded opening for aclamping set screw 23.

The spring clip 2|] is also provided with a detachable base member 24 towhich it is secured by an L-shaped punching 25. The base member 24 isalso provided with two hemispherical feet 26 which serve to hold mydevice in an upright position.

A wooden beam 21 is resiliently engaged by the clips l0 and when theprongs I3 of each clip imbed themselves in the wooden beam at pointsselected by the operator. The wooden beam 21 may be formed in sectionswhich are detachably united by a spring clip 28 provided with two prongsl3.

My beam compass is designed for easy demounting and for compact storagewhile utilizing a bow compass of common form for the marking element.While a bow pen is illustrated in the drawings a bow pencil may bereadily sub- 00 stituted for drawing a penciled line.

It should be understood that the present disclosure is for the purposeof illustration only,

and that the invention includes all modifications and equivalents whichfall within the spirit and scope of the appended claims.

What I claim is:

1. A drafting compass comprising a beam, a resilient U-shaped clipprovided with an inturned prong in a channel wall and an outwardprojection from a channel wall, a clamp for rigidly mounting a draftinginstrument on said outward projection, a second resilient clip providedwith an inturned prong in a channel Wall and with a downward projectionfor coupling with a base member, and a slotted base member adapted fordetachably receiving said projection and provided with a pivot clamp anda plurality of supporting feet.

2. A beam compass forming attachment comprising a U-shaped spring clampprovided with an inwardly projecting prong and a downward projection forattaching a base member, and a slotted base member adapted fordetachably receiving said projection, a pivot clamp rigidly mounted onsaid base member, and a plurality of supporting feet mounted on saidbase member.

3. A drafting compass comprising two beam sections, a resilient U-shapedcoupling clip provided with inturned prongs for uniting said beamsections, a resilient U-shaped clip provided with an inturned prong andan outward projection, a clamp for rigidly mounting a draftinginstrument on said outward projection, a third resilient clip providedwith an inturned prong and with a downward projection for detachablysecuring a slotted base member, and a slotted base member provided witha pivot clamp and a plurality f supp rtin feet.

CLARENCE M. WOODWARD.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date D. 102,387 Moses Dec. 15, 1936540,690 Rennerfelt June 11, 1895 839,604 Kralund Dec. 25, 1906 877,218Morgan Jan. 21, 1908 884,255 Zweigler Apr. 7, 1908 1,014,803 Bohn Jan.16, 1912 1,070,262 Knauf Aug. 12, 1913 1,146,176 Lambert July 13, 1915v1,200,598 De Roy Oct. 10, 1916 1,406,774 Straka Feb. 14, 1922 1,676,359Schwartz July 10, 1928 2,246,088 Clementz June 17, 1941 2,309,514 LaxoJan. 26, 1943 FOREIGN PATENTS Number Country Date 54,415 Germany a--Dec. 1, 1936

